Telephony.



A. H. DISON. TELEPHONY.

APPLICATION FILED APR.3. 1905.

WITNESSES:

PATENTED SEPT. 11, 19 06.

5 SHEETS-SHEET 1.

NO- 830,654. PATENTED SEPT. 11, 1906.

A. H. DYSON.

- TELEPHONY. APPLICATION FILED APR. 3, 1905.

5 SHEETS-SHEET 2.

WITNESSES: JNVEZVTOR. I

N0- 830,654. PATENTED SEPT. 11, 1906.

A. H. DYSON. TELEPHONY.

APPLIOATION FILED APR. 3, 1905.

5 SHEETS-SHEET 3- WITNESSES:

PATENTED SEPT. 11, 1906.

A. H. DYSON. TELEPHONY.

APPLICATION FILED APB.3. 1905.

6 SHEETS-SHEET 4.

INVENTOR.

WITNESSES.

PATENTED SEPT. 11, 1906.

A. H. DYSON. TELEPHONY. APPLIOATION FILED 11.3. 1905.

5 SHEETS-SHEET 5.

IF v F L VVE VTOR.

- UNITED STATES PATENT OFFICE.

ALFRED H. DYSON, or CHICAGO, ILLINOIS. ASSIGNOR ".ro MILO c. KELLOGG, or CHICAGO, ILLINOIS.

TELEPHONY.

Specification of Letters Patent.

Patented Sept. 11, 1906.

To all whom it may concern:

Be it known that I, ALFRED H. DYsoN, a citizen of the United States, and a resident of Chicago, county of Cook, and State of Illinois, have invented new and useful Improvements in Telephony, (Case C of which the following is a specification.

My invention relates particularly to telephone systems for furnishing measured service to subscribers.

It is adapted to be employed in connection with automatic telephone systems, and it is in connection with such a system that I have illustrated and described it. In the system shown a calling device is provided at subscribers stations adapted to transmit currents over the lines, the interconnection of -lines at the central oflice being secured by switchin mechanism responsive to these currents. n the said systems apparatus is provided to enable a calling subscriber to ring the bell of a connected called subscriber.

- In accordance with my invention the subscriber, whose substation is equipped with a 2 5 uneasured service or pay-station device such as I show and describe, is-enabled to establish connection between'his line and the line of the called subscriber without depositing a coin or token in the device. The coin must, however, be deposited in the pay-station device to enable the subscriber to rin the bell of a connected subscriber. for collecting the deposited coinupon. the response of the called-for subscriber and for re turning the coin to the calling subscriber in case the called-for subscriber fails to respond.

The object of my invention is to provide an efficient arrangement of the specified character.

Referring tothe drawings, Figures 1, 2, 3, 4, and 5 illustrate five different arrangements of substation apparatus embodying my invention. Fig. 6, consisting of Sheets 1 and 2, illustrates a portion of two telephone-lines terminating at the central office and automatic telephone-exchange switchboard apparatus adapted to operate in connection with the substation arrangements shown in the preceding figures to interconnect the said lines for conversation.

Referring first to Fig. 1, I show substation. apparatusconsisting of transmitter 1, induc- I provi e means after.

adapted to be rotated by the subscriber in the direction indicated by the arrow, returning when released to the normal position shown in the illustration, the ratchet-teeth of the device closing and breaking contact between sprin s 21 and 22 as many times as the subscriber as moved teeth of the ratchet below spring 22. After the last contact between springs 21 and 22 has been made and broken a ratchet-tooth closes and breaks contact between springs 18 and 19 a single time. Springs 22 and 18 are connected, respectively, to limbs P and S of the telephone-line, while springs 21 and 19 are connected to ground 17, the arrangement of the whole providing bell 10, and calling device 20. The latter is 55 means enabling the subscriber to establish possible the movement of ends 31 and 30 of arms 32 and 28 toward the middle and away from the middle of coin-slide 40. y

, The operation of the described pay-station device is as follows: A subscriber desiring .to ring another subscriber removes his telephone from the'hook, whereupon hook-lever 4 moves upward, breaking engagement with anvils 7 and 8 and engaging anvils 5 and 6. At the same time arm 32 being rigidly attached to hook-lever 4 moves its end 31 toward the middle of coin slide 40 until it rests in a position toward the inwardly-projecting end of slot 43. The subscriber may do this before he operates the calling device 20 to establish a desired conr ection or there- Havirg removed the receiver from its hook, the subscriber deposits a suitable coin in coin-slide 40, which descends by gravity until it rests upon ends 30 and 31 of arms 28 and 32. In this position it presses outwardly buffer 42, thereby causing spring 38 to' engage spring 37, thus placing the nindirg (.f 1

tion-coil 2, receiver 3, hook-lever 4, with its 1 established with the line oftbo desired sub associated anvils 5 6 and 7 8, condenser 9, .a somber, the calling subscnber now depresses 48, 49, and 50, with which may be associated multipled terminals of a plurality of second selector-switches, (one of which. I have illustrated at B,) which latter switches may be push-button 39, which engaging one edge of the deposited coin transmits its motion to buffer 42, engaged by the other edge, which in turn transmits the motion to'buffer 41,

electroinagnets shown at B include means responsive to further switching niovemenlgof i calling device 204 01" causing wipers 57, 58, l 59, and 60 to move over the terminals of the selected group of connector-switches, their l l subscriber retains control, by means of hooklever 4, of a deposited co'in at all times until the calledfor subscriber actually responds to the call.

Referring to Fig. 6, consisting of Sheets i and 2, I show at A a first selector-switch, which may be considered as connected by lines P and S with the substation illustrated 65 in Fig. 1, including movable switch-arms motion being arrested -automatically as soon ads of an idle switch.

as they engage termin Assuming this to occur when they engage ter- 47 l urinals 61, 62, 63, and 64 of connector-switch.

moving circuit-changing-switch spring 35 out l arranged in groups, the switches of each 70 of engagement with spring 36 and into engroup being adapted when their terminals gagement with spring 34. This establishes l are engaged by first selector-switches, such as ground to limb P of the telephone line I have illustrated at A, .for continuing cirthrough contact 34 35 and through contact cuits from telephone-lines connected to the 19 23 24 and causes the bell of the called-for said first selector-switches to certain-limited 75 subscriber to ring as long as the calling subgroups of subscribers lines represented by scriber holds push button 39 depressed. connector-switches. Included in "first-selec- When he releases it, it resumes its normal potor-switch A, I have illustrated a suitable orsition, as shown, spring 35 resumes its norganization of circuits and electromagnet's mal position in engagement with spring 36, adapted in response to switching movements 80 disengaging spring 34, springs 37 and 38 of calling-device (illustrated in Fig. 1) to maintaining their before --described engageenable, the calling subscriber to select the merit. When the called-for subscriber rel group of second selector-switches appropriate sponds to the call, he causes a source of curfor establishing a desired connection. he :0 rent at the central office to be included in the circuits and electromagnets shown at A in- 8 5 metallic circuit of the telephone-line of the elude means responsive to further switching calling subscriber, current therefrom passing movement of calling device 20 for causing through the substation (illustrated in Fig. 1) wipers 47, 48, 49, and 50 to move over the over the following path: over limb P oi the terminals of the selected group of second se- 2 5 telephone-line,throughcontact2423,through lector-switches, their motion being arrested 90 contact between springs 35 and 36, the said automatically as soon as they engage termicurrent thereupon dividing, aportion flowing nals of an idle switch. Assuming that the through transmitter 3 through contact 6 4, subscriber, whose substation isillustrated in through contact 4 5, t zrough one winding of i Fig. 1, is making a call, has selected a group inductioncoil 2, retur aing over limb S of the of second selector-switches, including switch 95 telephone line, another portion flowing B, and that wipers 47, 48, 49, and 50 of through the winding of electromagnet 25, switch A have been arrested when engagthrough contact between springs 38 and 37, ing multipled terminals 51, 52, 53, and 54 returning over limb S of the telephone-line. of switch B, the said switch may now be The last-described flow of current energizes operated under control of calling device 09 electromagnet 25, which thereupon attracts 20 of Fig. 1. Included in the mechanism its armature 26. Arm 27 is pivoted to armaof the said second selector-switch are wipers -ture 26 and arm 28, which latter arm is piv- 57, 58, 59, and 60, with which may be asoted at 29. The aforementioned attraction sociatcd multipled terminals of a plurality of armature 26 causes arm 28, turning upon of connector -switches, one of which I have 5 its pivot 29, to move end 30 in slot 44 to the illustrated. at C, which. latter switches may side of coin-slide 40. This movement places be arranged 'in' groups, the switches of end 30 in a position where it no longer acts as each group being adapted, when their tera support to the deposited coin, which thereminals are engaged by second selector- 5 upon descends by gravity through portion switches in operative relation with subscrib- I10 46 of coin-slide 4Q into a receptacle provided ers lines, for continuing circuits from Sue for collections. Iii case the called-for snbtelephonedines through to a certain limited soriber fails to respond to the call the calling number of subscribers'lines. Included in secsubscriber replaces receiver 3 upon the hook, 0nd selector-switchB, .lhave illustratedasuit 50 and the resulting movementofliook-lever4r6- able organization of circuits and electroniag I I 5 turns end 31 of arm 32 to its normal position, nets adapted in response to switching moveas shown in Fig. l, and the said end no longer merits oi calling device 20 (illustrated in Fig. serves as a support to the deposited coin. 1) to enable the calling subscriber to select a The latter descends by gravity through porgroup of connector-switches appropriate for 5 5 tion of coin-slide 40 and is returned to the establishing connection directly to the line of I2 subscriber. It will be noted that the calling the desired subscriber. The circuits and C, the said connector-switch. may be operated under control of calling device of Fig. 1.

181, 182, and 183 of the said line. the line of the called subscriber is busy con- Included in connectonswitch O are wipers '78, 79, and 80, with which are associated. multipled terminals of a plurality of subscribers lines adapted to be engaged by wipers 78, 7 9 and 80. IncludedinconnectorswitchC. I have illustrated a suitable or ani- 'zation of circuits and electromagnets a apted in response to switching movements of calling device 20 (illustrated in Fig. 1') to enable the calling subscriber to'cause wipers 7 8, 79, and 80 of the connector-switch to picl;

out and engage terminals of any desired subscribers line in the group of lines whose terminals are associated with connector-switch C. Assumin that the desired subscribers line is inclu ed in said group and is that whose first selector-switch is shown at D, the calli subscriber causes wipers 78, 79, and 80 to e placed in engagement with terminals In case hector-switch C is automatically released and returns to normal, wipers 78, 79, and 80 disengaging the terminals 181, 182, and 183,

and the calling subscriber receives the characteristic busy-signal from busy-back machine 85.

He thereupon replaces his receiver upon the switch-hook, which in case he has already deposited the coin causes the return of the coin to himself. The above-described act also operates to disconnect second of the telephone-line .of the calling subscriber through. contact between arm 93 and contact-point 94, through. contact 49 53,-through contact between arm193 and contact-point 194, through contact 59 63, through condenser 7 2, through contact between arm .101 and contact-point 102, through contact 79 182 over liinb P of the called-for subscribers line, through the substation ringing equipment, over limb S of said line, through con- .tact-183 89, contact between contact-point 104 and arm 103, through condenser 73, throtigh contact 64 60, throughcontact between contact-point 196 and arm' 1%,

through contact 54 50, through contact between contact-point 96 and arm 95 over limb S of the calling-subscribers line and through the substation to limb P of said line. The calling subscriber in this case rings the bell of tion. When the called-for subscriber responds to'the call by removing the receiver from the switch-hook, he closes circuit at the substation between limbs P and S of. his telephone-line, establishing a path for the flowof current as follows: from the grounded side of battery 125, through the winding of relay 67, in circuit therewith, through contact 101 102, through contact 79 182 ,over limb P of the,

- telephone-line, returning over limb S, through contact 183 80, through contact 104 103, through the other winding of relay 67 to the active side of battery 125.

rent energizes the said relay and supplies current for talking purposes to the transmitter of the called-for subscriber. tion of relay 67 attracted armatures 126 and 127, establishing a' path for the flow of current as follows: from the grounded side of battery 70, over conductor 68, through armature 126, through contact 63 v59,'contact 194' 193, contact 53 49, through contact 94 93, over limb P, of the calling-subscribers line, through the'substation of Fig. 1, causing the deposited coin to be collected in the manner previously described, the current returning over limb S of the said line, through contact between arm 95 and contact-point 96, through contact 50 54, contact between arm 195 and contact-point 196, through contact 60 64, through the winding of electromagnet 66, armature 127, conductor 69, to the active side of battery 70. This flow of current sup- The energizaplies current for talking purposes to the i transmitter of the calling subscriber. 'The subscribers. are now in conversation. When they have finished their conversation, they replace theirreceivers on the hooks. When either subscriber does this, connector-switch O is released, and when the calling subscriber does so the second selector-switch B and first v 'selector-switch A are also released. 4

the same battery.

Referring now' to Fig.2, the arrangement there shown is generally similar to that illus- In the said Fig. 2, how

tratedin- Fig. 1. ever, the Winding of electromagnet 25 is normally in parallel with the talking-circuit 0fthe substation. When the coin is deposited in slide 40 preparatory to ringing, its engagement with buffer 42 causes spring 37 to disengage s ring 3L thereby placing the winding of e ectromagnet 25 in series with the talking-circuit of the substation. The bell of the, called-subscribers line is rung in the manner similar to that described in connection with the an angement of Fig. 1 but upon the response of the called subscriber the current causing the energization of electromagthe called-for subscriberin'the manner all net 25 to. collect the depositedcoinpasses ready described in connection with Fig. 1, a 1 through the said winding 1n ser 1es with the coin having been deposited in the pay-stal talking-circuit. The collection of the com rro c uses spring 37 to again engage spring 38,

ieestablish' 1g the normal talking-circuit of ing of electromagnet 25, energizing the substation, the winding of electromagnet being in parallel with the talking-circuit during conversation.

Referring now to Fig. 3, the arrangement there shown is similar to that shown in Fig. 1, with the exception that different means are provided for returning a deposited coin to the subscriber. In the present figure an addi tional electromagnet 25 is provided, its armature 26 operating to move end 31 of arm 28 away from its normal position (shown in the'illustration) when the electromagnet is energized, accomplishing the return of-the deposited coin by withdrawing the said end 31 out of-supporting relation with the said coin. The energization of the said electromagnet is accomplished in the following man ner: When the subscriber replaces lns' receiver on the hook, the portion of hook-lever 4 designated 11 engages spring 14 as it moves upward, causing spring 14 to engage spring 13 and spring and? as it continues spring 14, allowing this movementreleases the said'springs to re- This temporary engagement of springs 12 and 13.;establishes a path for the flow of current from magnet 25 throu h contact between springs 12 and 13, through contact 23 24, over limb P of the line to battery at the central office, energizing the said electromagnet 25*.

Referring to Fig. 4, the arrangement there illustrated embodies means similar to those described .in connection with curingthe returnof the deposited coin to the subscriber. The circuit arrangement of elec tromagnet 25 illustrated in the said figure is similar to that of the similarly-designated electromagnet described in connection with Fig. 2. Ff.

Referring to Fig. 5, the arrangement there shown provides means similar to those described in connection with Figs. 1 and 2 for securing the return of a deposited coin to the subscriber. In the present figure arm 28 is jointly controlled by electromagnets 25 and 25". In the previously-described arrange.

ments the return of arm' 28 to its normal position upon the deenergization of electromagnet 25 was secured by gravity. In the present structure this return is secured by the permanent magnetism of polarlzed elec tromagnet 25 The windings of the two electromagnets are normally in parallel with the talking-circuit of the substation. When a coin is deposited in the slide, the windings of the-two electromagnets are placed in series with the talking-circuit by the disengagement of spring 37 from spring 38. When the called-for subscriber, inanswering the the call, includes current in the metallic circuit of the line of the substation illustrated in 13 to engage spring 12,,

round 15 through the winding of electro* Fig. 3 for sethe windelectromagnet, and through the winding of electromagnet 25 in a direction to neutralize the permanent magnetism of the said electromagnet, thereby, neutralizing the attractive force normally holding armature 26 in the position illustrated andenabling electromagnet 25 to freely attract its armature 26 to move. arm 28 to collect the de ositedrcoin. As soon.as current ceases to ow through electromagnets 25 and 25 the permanent magnetism of the latter magnet, no longerneutralized, causes the" attraction of its armature 26 to cause the return of arm 28 to its normal position. (Shown in Fig. 5.)

It will benoted in the arrangement shown in Fig. 5 that the current for causing the collection of a de osited coin must be in a direction to neutra ize the permanent magnetism of electromagnet 25. Should current be caused to flow over the line in a reverse direcwill aid the permanent magnetism of relay 25 in holding its armature in its attracted normal position, and this combined attractive force will overbalance the attractive force which relay 25 exerts upon its armature 26. Armature 26 under these circumstances remains unmoved, and a deposited coin would therefore not be collected. Other arrangements of polarized electromagnetic apparatus may be employed to secure t e above-described method of operation. he interchangeable use of such structures as are illustrated in Figs. 1 to 5 as pay-stations and call-counters is well known.

I claim- 1. In an automatic telephone exchange system, the combination with a calling-subscribers line and a called-subscribers line switched to electrical connection at the cention, the induced magnetic effect tral ofiice, of a pay-station device associated with the lineof the calling subscriber at the substation, adapted to receive a deposited coin, switching mechanism associated with said device, ringing mechanism under control of the subscriber adapted to effect a movement' of a deposited coin to operate said switching mechanism, means adapted, in response to the operation of said mechanism, to cause the bell of the called subscriber to ring, and apparatus associated with said device for collecting a deposited coin adapted to be operated by the response of the called subscriber.

2. In an automatic telephone-exchange system, the combination with a calling-subscribers line and a called-subscribers line switched to electrical connection at the central ofiice, of a pay-station device associated with the line oflthe calling subscriber at the. substation, adapted to receive a deposited coin, switching mechanism associated with said device, ringing mechanism under con-, trol of the subscriber adapted to elfect a scriber, and apparatus associated with said pay-station device and controlled by the calling subscriber adapted to release a deposited coin and destroy tneconnection prior to the response of the called subscriber.

3. In an automatic telephone exchange system, the combination with a calling-subscribers line and a calledsubscribe1"s line switched to electrical connection at the central office, of a pay-station device associated,

with the line of the calling subscriber at the substation, adapted to receive a deposited coin, a push-button adapted, when depressed by the subscriber, to engage a deposited coin and cause movement thereof, a circuit-changing spring associated with said device, mechanical means for transmitting the motion of said coin to said spring, switching apparatus adapted, in response to such motion of said spring, to cause the bell of the called subscriber to ring and apparatus associated with said device for collecting said coin adapted to be operated by the-response of the called subscriber.

4. In an automatic telephone-exchange system, the combination with a calling-subseribers line and a called-subsr:ribei"s line switched to electrical connection at the central office, of a pay-station device associated wir h the line of the calling subscriber at the substation, adapted to receive a deposited r oin, a push-button adapted, when depressed by the subscriber, to engage a deposited coin and cause movement thereof, a circuit-changing spring associated wit-h said device, me chanical means for transmitting the motion of said coin to said spring, switching apparatus adapted, in response tosuch motion of said spring, to cause the bell of the called subscriber to ring, apparatus associated with substation, adapted to receive ads-posited coin, switching mechanism associated with said device, ringing mechanism under control of the subscriber adapted to effect a movement of a deposited coin to operate said switching mechanism, means adapted, in response to the operation of said mechanism, 'to cause the bell oi the called subscriber to ring, an electromagnet in circuit with the callingsubscribers line at tne substation adapted to be energized upon the response of the called subscriber and mechanism controlled by said electromagnet adapted, upon its energization, to collect a deposited coin.

6. In an automatic telephone-exchan e system, the combination with a calling-su scribers line and a called-subscribers line switched to electrical connection at the central office, of a pay;station device associated with the line of the calling subscriber at the substation, adapted to receive a deposited coin, switching mechanism associated with said device, ringing mechanism under control of the subscriber adapted to effect a move-' ment of a deposited coin to operate said switching mechanism, means adapted, in response to the operation of said mechanism, to

cause the bell of the called subscriber to ring,

anelectromangnet in circuit with the callingsubscribers line at the substation adapted to beenergized upon the response of the called subscriber, mechanism controlled by said electromagnet adapted, upon its energiza tion, to collect adeposited coin, and apparatus associated with said pay-station device and controlled by the calling subscriber adapted to release a. deposited coin and destroy the connection prior to the response of the called subscriber.

7. In an automatic telephone-exchange system, the combination with a calling-subscribers line and a called subscriber's line switched to electrical connection at the central office, of apay Station device associated with the line of the calling subscriber at the substation, adapted to receive a deposited coin, a push-button adapted, when depressed by the subscriber, to engage a deposited coin and cause movement thereof, a circuit-changingspring associated with said device, me-

chanical means foi transmitting the motion of said coin to said spring, switching apparasaid devlce for collecting a deposited corn l adapted to be operated by the response-of the tus adapted, in response to such motion-of said spring, to cause the bell of the called subscriber to ring, an electromagnet in. circuit with the calling-subscribers line at the substation adapted to be energized upon the response of the called subscriber, and inechan ism controlled by said electromagnet adapted, upon its energization, to collect a deposited coin.

8. In an automatic telephone-exchan e system, ,the combinaticn with a calling-subscribers line and a called-subscribers line switched to electrical connection at the central office, of a pay-station device associated with the line of the calling subscriber at the substation, adapted to receive a deposited coin, a push-buttou adapted, when depressed by the subscriber, to engage said coin and collect a deposited coin,

\ scribers line adapted to be 0 ,ti'ol of the-subscriber adapted to effect acause movement thereof, a circuit-changing spring associated with said device, mechan ical means for transmitting the motion of a deposited coin to said spring, switching apparatus adapted, in response to such motion of said spring, to cause the bell of the called subscriber to ring, an electroinagnetin circuit with the callin subscribers line at the substation adapte to be energized upon thc response of the called-subscriber, mechanism controlled by said electromagnet adapted, upon its energization, to collect a deposited coin, and apparatus associated with said paystation device and controlled by the calling subscriber adapted to release a deposited coin and destroy the connection prior to the response of the called subscriber. h

9. In an automatic telephone-exchange system, thecombination with a calling-subscribers line ,and a calledsubscribers line switched to electrical connection at the central ofiice, of a aystation device associated with the line 0 the calling subscriber at the substation, adapted to receive a deposited coin, switching mcchanism'associated with said device, ringing mechanism under control of the subscriber adapted to effect a movenftnt of said coin to operate said switching mechanism, means'adapted, in response to the operation of said bell of the called subscriber to ring, an electromagnet in circuit with the calling subscribers line at the substation adapted to be energized upon the response of the called subscriber, mechanism controlled by said elec-- its energization, to and a relay at the with the called-suberated. by the response of the called subscri er to energize said electromagnet by causing a flow of current over the calling-subscribers line.

10. In an automatic telephone-exchan e system, the-combination with a calling-,su i

scriber s line and a called-subscribers line tromagnet adapted, upon central ofiice associated switched to electrical connection at the cen-- tral ofiice, of afpay-s'tation device associated with the line 0 thecalling subscriber at the,

substation, adapted to. receive a-deposite'd.

coin, switching mechanism associated withsaid device,'r1ng1ng mechanism under conmovement of 'said'coin to operate .said

rin',

switching mechanism, means-adapted, in re-. sponse to the o .to cause the be l-of' the called subscriber'to an electromagnetyin circuit with the cal ing-subscriber s line at 'the substation adapted to be energized upon the response of the called subscriber, mechanism controlled by said electromagnet adapted, upon its energization, to collect a deposited coin, a 'relay atthe central ofiiceassociated with the calledsubscribers line adapted to beopersaid coin to said spring,

mechanism, to cause the adapted, in response to such spring, tocausethe bell of that called sub eration of said mechanismg ceases ated by the response of the called subscriber to energize said .electromagnet by causing a flow of current over the calling-subscribers line, and apparatus associated with said pay: station device and controlled by the calling subscriber adapted to release a deposited coin and destroy the connection prior to the response of the called subscriber. i,

11. In an automatic. telephone-exchange system, the combination with a calling-subscribers line and a called-subscribrs line switched to electrical connection atthe central oifice,

substation, adapted to receive a deposited coin, a push-button adapted, when depressed by the subscriber, cause movement thereof, a circuit-changing spring associated with said device, mechanical means for transmitting the motion of switching apparatus adapted, in response to such motion of said spring, to cause the bell of the called sub scriber to ring, an electromagnet in circuit with the calling-subscribers line at the substation adapted' to be energized upon the response of the called subscriber, mechanism controlled by said 'electromagnet adapted upon its energization to collect a deposited coin, and a relay atthe central ofiicea'ssociated with the called-subscribers line adapttoengage said coin and of a pay-station device associated with the line of the calling subscriber attire ed to be operated by the response of the called subscriber to energize said electromagnet by causing a flow of current over the calling-subscribers line. v

12. In an automatic telephone-exchange system, the combination with a calling-subscribers switched to electrical connection at the cen tral oflice, of a pay-station device associated with the line of the calling subscriber at the substation, adapted to receive a deposited ppm, a push-buttonadapted, when depressed Y the subscriber, to engage said coin" and cause movement thereof, a circuit-changing spring associatedwith said device, mechane' for transmitting the motion of ical means said coin to said spring, switching apparatus scriber to ring, an electrom'agiiet inicircuit with the calling subscribers line at the substation adapte upon its energization, to collect adeposited coin, a'relayat the central office associated {with the called-subscribers line adapted to beoperated by the response of the called sub-' scriber to energize said .electromagne't .by causing show of currentover the callmg-sub' scribers line, and ap said pay-station device and controlled b'ythe calling subscriber adapted to; release a depos line and a called-subscribiars line motion of said I g f to be energized upon the response of the called =subscriber, mechanism controlled by said electromagnet ad apted,

para'tus associated with said device, ringing mechanism under con- Itrol 'of the subscriber adapted to effect a :movement of said coin to operate said i a coin, a relay at the central ofiice associated scriber to energize said electromagnet by with the line of the calling subscriber at the tion of said coin to place said electromagnet in ited coin and destroy the connection prior to the response of the called subscriber.

13. In an automatic telephone-exchange system, the combination with a calling-subscribers line and a called-subscribers line switched to electrical connection at the central ofi'ice, of a pay-station device associated with the line of the calling subscriber at the substation, adapted to receive a deposited coin, switching mechanism associated with switching mechanism, means adapted, in response to the operation of said mechanism, to cause the bell. of the called subscriberv to ring, an electromagnet associated "with said device switched into operative relation with the calling-subscribers line by the deposit of with the called-subscribers line ada ted to be operated by the response of the cal ed subcausing a flow of current over the cadingsubscrib'ers line, mechanism controlled by said electromagnet adapted, u on its energization, to collect a deposite coin, and a switch adapted to be actuated by the collecinoperative relation with the telephone-line.

14. In an automatic telephone-exchan e system, the combination with a calling-Sn scribers line anda called-subscribefls line switched to electrical connection at the central ofli-ce, of a pay-station device associated substation, adapted to receive a deposited coin, switching mechanism associated with said device, ringing mechanism under control of, the; subscriber adapted to effect a movement of said coin to operate said switching mechanism, means adapted, in response to the operation of said mechanism, to cause the bell of the called subscriber to ring, an electromagnet associated with said device switched into operative relation with the calling-subscribers line by the deposit of a coin, a relay at the central oflice associated with the called-subscribers lineiadapted to be operated by the response of the called subscriber to energize said electroinagnet by causing a flow of current over the calling-subscribers line, mechanism controlled by said electromagnet adapted, u on its energization, to collect a deposited coin, apparatus associated with said pay-station device and controlled by the calhngsubscriber adapted to release a deposited coin and destro the connection prior to the response 0 the called subscriber, and a switch adapted to be actuated by the collection or release of said coin to place said electromagne't in inoperative relation with the telephone-line. I

said coin to said spring, switching apparatus spring, to cause the bell of the called subscriber to ring, an electromagnet associated with said device switched into operative relation with-the calling-subscribers line by the deposit of a coin, a relay at the central oilice associated with the called-subscribers line-adapted to be operated by the response of the called subscriber to energize said electromagnet by Causing a flow of current over the calling-subscribers line, mechanism controlled by said electromagnet adapted, upon its energization, to collect a deposited coin, and a switch adapted to be actuated by the collection of said coin to place said electromagnet in inoperative relation with the telephone-line.

16. In an automatic telephone-exchange system, the combination witha calling-subscribers line and a called-subscribers line switched to electrical connection at the central ol'lice, of apay-station device associated with the line of the calling subscriber at the substation, adapted to receive a deposited coin, a imsh-button adapted, when depressed by the subscriber, to engage said coin and cause movement thereof, a circuit-changing spring associated with'said device, mechanical means for transmitting the motion of said coin to said spring, switching apparatus adapted, in response to such motion of said spring, to cause the bell of the called subscriber to ring, an electromagnet associated with said device switched into operative relation with the calling-subscribers line by the deposit of a coin, a relay atthe central oilice associated with the called-subscriber"s line adapted to be operated by the response of the called subscriber to energize said elec' tromagnet by causing a flow of current over the.calling-subscribers line, mechanism controlled by said electromagnet adapted, upon its energization, to collect a deposited coin, apparatus associated with said pay-station device and controlled by tl.e calling subscriber adapted torelease a deposited coin and destroy the connection prior to the response of the called'subscriber, and a switch adapted to be actuated by the collection or releaseof said coin to' place said electromagadapted, in response to such motion of said pet in inoperative relation with the telephoneine.

17. In an automatic telephone-exchange system,- the combination with a callin -subscribers line and a called-subscriber s line switched to electrical connectionatthe central office, of a pay-station device associated with the line of the calling Subscriber at the substation, adapted to receive 'a deposited coin, switchin mechanism associated with said device, ringing mechanism under control of the. subscriber adapted to effect a movement of said coin to operate said switching mechanism, means ada ted, in response to the operation of said nice anism, to cause the bell of the called subscriber to ring, a central source of current, apparatus at the central o'liice adapted to be operated by the response of the called subscriber to include current from said source in the line of the calling subscriber in a predetermined direction, and apparatus associated with said paytation device adapted to collect a deposited coin responsive only to a flow of current over said line in said predetermined direction.

18. In an automatic telephone-exchange system, the combination with a calling-subscribers line and a called-subscribers ,line switched to electrical connection at the central office, of a pay-station device associated with the line of the calling subscriber at the substation, adapted to receive a deposited coin, a push-button adapted,when depressed by the subscriber, to engage said coin and cause movement thereof, a circuit-changing spring associated with said device, mechanical means for transmitting the motion of said coin to said spring, adapted, in response to such motion of said spring, to cause the bell of the called subscriber to ring, a central source of current,

- apparatus at the central office adapted to be operated by the response of-the called subscriber to include current from said source in the line of the calling subscriber in a predetermined direction, and apparatus associated with said pay-station device adapted to collect a deposited coin responsive only to a flow of current over said line in said predetermined direction. l

19. In an automatic telephoneexchan e system, the combination with a calling-s11 '7 scribers line and a called-subscribers line switched to electrical connection at the central office, of a pay-station device associated with the line of the calling subscriber at the substation, adapted to receive a deposited coin, switching mechanism associated with said device, ringing mechanism under control of the subscriber adapted to effect a movement of said coin to operate said switching mechanism, means adapted, in response to switching apparatus the operation of said mechanism, to cause the bell of the called subscriber to ring, a central source of current, apparatus at the central office adapted to be operated by the response of the called subscriber to include cur rent from said source in the line of the calling subscriber in a predetermined direction, an electromagnet in circuit with the calling-subscribers line at the substation adapted to be energized upon the response of, the called subscriber and mechanism controlled by said electromagnet adapted, upon its energization by a flow of current in said predetermined di rection and then only, to collect a deposited com.

20. In an automatic telephone-exchange system, the combination with a calling-subscribers line and a called-subscribers line switched to electrical connection at the central office, of a pay-station device associated with the line of the calling subscriber at the substation, adapted to receive a deposited coin, a push-button adapted, when depressed by the subscriber, to engage said coin and cause movement thereof, a circuit-changing spring associated with said device, mechanical means for transmitting the motion of said coin to' said spring, switching apparatus adapted, in response to such motion of said spring, to cause the bell of the called subscriber to ring, a central source of current,

. apparatus at the central office adapted to be operated by the response of the called subscriber to include current from said source in the line of the calling subscriber in a predetermined direction, an electromagnet in circuit with the calling-subscribers line at the substation adapted to be energized upon the response of the called subscriber, and mechanism controlled by said electromagnet adapted, upon its energization by a flow of current in said predetermined direction and then only, to collect a deposited coin.

21. In an automatic telephone-exchange system, the combination with a calling-subscribers line and a 'called-subscribers line switched to electrical connection at the central ofiice, of apay-station device associated with the line of the calling subscriber at the substation, adapted to receive va deposited coin, switching mechanism associated with said device, ringing mechanism under control of the subscriber adapted to effect a movement of said coin to operate said switching mechanism, means adapted, in response to the operation of said mechanism, to cause the bell of the called subscriber to ring, an electromagnet in circuit with the callin sub scribers line at the substation adapte to be energized upon-the response'of the called subscriber, mechanism controlled by said elec- TOO IIC

,tromagnetiad apted, upon its energization by a flow of current in a predetermined direction and then only, to collect a deposited coin, and a relay atthe central office associated with the called-subscribers line ada ted to be operated by the response of the cal ed subscriber toenergize said electromagnetby causing aflow of current over the calling-subscribers line said predetermined direction.

In witness whereof I heretinto subscribe my name this 1st day of'April, A. D. 1905.

ALFRED H. DYSON. Witnesses G. E. MUELLER, L. D. KELLOGG. 

